Dear list- I am trying to do some clustering using the 'hopach' package as described in chapter 13 of the monograph. I can successfully cluster the data using the hopach function.... yhopac <- hopach(y) but I can't figure out how to view the clustered data as a heatmap. I have tried tab2<-as.matrix(y) heatmap(tab2, hclustfun = hopach) but it crashes and I get the following.... Searching for main clusters... Level 1 Level 2 Level 3 Level 4 Level 5 Level 6 Level 7 Level 8 Level 9 Level 10 Level 11 Level 12 Level 13 Level 14 Level 15 Identified 37 main clusters in level 3 with MSS = 0.08025142 Running down without collapsing from Level 3 Level 4 Level 5 Error in as.dendrogram(hcr) : no applicable method for "as.dendrogram" can anyone point me in the right directions? thanks in advance Ivan > sessionInfo() Version 2.3.0 (2006-04-24) i386-pc-mingw32 attached base packages: [1] "methods" "stats" "graphics" "grDevices" "utils" "datasets" [7] "base" other attached packages: gregmisc gplots gmodels gtools gdata hopach cluster RWinEdt "2.0.8" "2.3.0" "2.12.0" "2.2.3" "2.1.2" "1.4.1" "1.10.5" "1.7-4" -- ************************************************************** Ivan Baxter Research Scientist Bindley Bioscience Center Purdue University 765-543-7288 ibaxter at purdue.edu